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  1. MGZmechanical

    2507 superduplex welding residual stress relieving and permanent deformations

    Hi, we have made a valve for water at low pressure (2 bar) in superduplex 2507 welding thick parts (100 mm - 4"). The valve stress levels are very low (100 MPa at test pressure 3 bar). But we are getting permanent deformations and each time we make a test at 3 bar it deforms a bit more...
  2. MGZmechanical

    Three weld seams encounter at one point

    Good morning, we are designing a pressure vessel and at one point we have three weld seams that coincide. Does anyone know if there are limitations in the codes (no matter ASME or EN) to this? Regards,
  3. MGZmechanical

    Explosion in chemical plant in Tarragona (Spain)

    https://elpais.com/elpais/2020/01/16/inenglish/1579162775_866279.html One of the victims is a man who was sitting inside his home, two kilometers away from the site of the accident. Firefighters have located a one-ton piece of metal that went flying through the air from the force of the blast...
  4. MGZmechanical

    Bronze cladding for lower friction.WPS/PQR needed?

    Hi, we have a valve for which all the pressure bearing weldments have their WPS/WPQR and qualified welders. But we have a bronze cladding just to lower the friciton. Is not a pressure bearing, nor under stress. Do I need a the same process as for the pressure bearing weldments? Best regards
  5. MGZmechanical

    Force in lead screw to prevent rotation

    Designing a lead screw. Usually we have a very strong guide that prevents the screw from rotating. But now we have a case with a weak guide and we were thinking about the necessary force to prevent it from rotating. My assumption is: we need to lift 1000 kg with a 24 mm screw --> Necesary...
  6. MGZmechanical

    Counter balance valve and pressure due to thermal expansion of oil in cylinder

    Hi, I've a question regarding counter balance valves. In a typical circuit as attached but in my case the cylinder pulls downwards. Sometimes the load is stopped at intermmediate positions for long times and sometimes the pressure is needed to keep the load firmly attached to the ground. The...
  7. MGZmechanical

    Weld size in pressure vessel

    Hi, we're designing a pressure vessel and after performing the calculations there is one part that with 8 mm thickness is enough (corrosion allowance already included). Going to the next standard plate of 10 mm the weld thickness (two sides) is 0.7·10 = 7 mm which we can make in a single layer...
  8. MGZmechanical

    tube with ribs welded to flange

    Hi, I've a doubt. We've an application welding a round tube to a round flange with ribs (see image). We use to design this with clips in the ribs so the weld of the ribs do not go over the flange weld. But recently I've found a document from Corus with the detail in image. Welding on weld and...
  9. MGZmechanical

    ISA control valves Kv vs Pneumatic Kv

    Hi, I'm checking some formulas for Kv and I've seen different formulas. I use Norgren and ASCO formulas for pneumatic Kv value: Kv = (Q/514) · sqrt(T1/(Dp·p2)) Now the ISA control valve handbook is: Kv = (Q/(482·Y))·srqt(T1·Z/(Dp·p1)) So, if Y and Z are approximately 1 for air this is: Kv =...
  10. MGZmechanical

    Pneumatic cylinder valve CV sizing

    Hi, I'm dimensioning some pneumatic actuators and I have a doubt choosing the valves. I think the correct option is number 1 in the file attached. The I saw the reccomendations from Parker Link Which one is correct? the difference in Kv (and money) can be quite big. regards,
  11. MGZmechanical

    Distance between tapered pins

    Hello. I'm designing a shaft - hub joint with tapered pins. The problem is that the hub is quite short and I have to use two pins due to the high torque. Is there any reccomendation about the minimum distance between pins? Thanks
  12. MGZmechanical

    Detail view SW 2010

    Hi, I'm starting to draw with SW (coming from AutoCAD). and I'm wondering how to deal with detail views. My problem is as follows. I have a a big part with some small chamfers. So in my drawing I want a big view with no chamfers and a detail view of the corners in wich I could see the chamfers...
  13. MGZmechanical

    EN 13445-3 flat bottom weld detail and fatigue

    Hi, we're designing a pressure vessel according EN 13445. We've to do some flat bottom weldig and we're looking at EN 13445-3 Annex A Table A-3 details E19 and E25. I'm a bit surprised that the throat thicknesses are: - for E19 a = 0,7*e on each side - for E25 a = e on each side. I think that's...
  14. MGZmechanical

    Material properties at high temperature

    Hello. I'm designing a damper (low pressure valve not covered by the pressure equipment directive) for 400 ºC. The material is standard S275JR, low carbon steel. Now i'm having a problem, there's no "official" data for this material at that temperature. I've seen two references: - Eurocode for...

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